The dSLR will die out. The reflex mirror is an overly complex solution to a problem which can be solved much better by alternative technology.

All current cameras will become economically worthless within 10 years as their performance is exceeded by cameras which are cheaper and more convenient.

Fortunately, the quality of the camera or the technical quality of the images it produces has nothing to do with the longevity or long term value of the images it produces. No camera will ever become worthless as an image making tool until it stops working.

The OP is perfectly correct in implying that the photos which we strive hardest to perfect will generally become worthless. Our artistic vision can always be replicated and the only reasons a photo will retain value over time are due to its connection to the photographer who took it or the people, places or events it depicts.

Like it or not, the majority of the badly focussed and poorly composed cellphone shots of family and friends which litter facebook will far outlast our best dSLR inspired artistic masterpieces. Our artistic vision can easily be replicated, is seldom original and consequently holds little special value to anyone other than the photographer. Images of people and events are always original and impossible to replicate and always have meaning to someone.

A sobering, but at the same time inspiring thought.--Have FunPhoto Pete

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